Overview
The ADS8881IDGSR is an 18-bit, 1-MSPS (mega-samples per second) analog-to-digital converter (ADC) produced by Texas Instruments. This device features a true-differential input and operates with a SPI-compatible serial interface. It is designed for low-power consumption and is suitable for a variety of applications, including automatic test equipment (ATE), precision medical equipment, and low-power, battery-operated instruments. The ADS8881IDGSR offers excellent AC and DC performance, making it a reliable choice for high-precision data acquisition.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 18 Bits | |
| Sample Rate | 1 MSPS | |
| Analog Input Range | –VREF to +VREF | V |
| Common-Mode Voltage Range | 0 V to VREF | V |
| Reference Voltage Range | 2.5 V to 5 V | V |
| Analog Power Supply (AVDD) | 2.7 V to 3.6 V | V |
| Digital Power Supply (DVDD) | 2.7 V to 3.6 V | V |
| Operating Temperature (ADS8881C) | 0°C to +70°C | °C |
| Operating Temperature (ADS8881I) | –40°C to +85°C | °C |
| Power Consumption at 1 MSPS | 5.5 mW | mW |
| Power-Down Current (AVDD) | 50 nA | nA |
| Conversion Time | 500 ns to 710 ns | ns |
| Acquisition Time | 290 ns | ns |
Key Features
- True-Differential Input: Supports unipolar, true-differential analog input signals with a differential input swing of –VREF to +VREF.
- Low Power Consumption: Power dissipation scales with speed, making it suitable for lower-speed applications. Typical power consumption is 5.5 mW at 1 MSPS.
- SPI-Compatible Serial Interface: Supports daisy-chain operation for cascading multiple devices.
- Excellent AC and DC Performance: Integral nonlinearity (INL) and differential nonlinearity (DNL) are tightly controlled, ensuring high accuracy. SNR is up to 100 dB, and THD is –115 dB.
- Wide Operating Range: Independent analog and digital power supplies, and a wide reference voltage range.
- Low Noise and High CMRR: Common-mode rejection ratio (CMRR) of 90 dB, ensuring robust performance in noisy environments.
Applications
- Automatic Test Equipment (ATE): Ideal for high-precision testing and measurement.
- Precision Medical Equipment: Suitable for medical devices requiring accurate and reliable data acquisition.
- Instrumentation and Process Controls: Used in various industrial applications where precise measurement is critical.
- Low-Power, Battery-Operated Instruments: Optimized for low power consumption, making it suitable for battery-powered devices.
Q & A
- What is the resolution of the ADS8881IDGSR ADC?
The ADS8881IDGSR has a resolution of 18 bits. - What is the maximum sample rate of the ADS8881IDGSR?
The maximum sample rate is 1 MSPS. - What is the input range of the ADS8881IDGSR?
The input range is –VREF to +VREF. - What is the common-mode voltage range of the ADS8881IDGSR?
The common-mode voltage range is 0 V to VREF. - What are the power supply ranges for the ADS8881IDGSR?
The analog power supply (AVDD) and digital power supply (DVDD) ranges are 2.7 V to 3.6 V each. - How much power does the ADS8881IDGSR consume at 1 MSPS?
The power consumption at 1 MSPS is typically 5.5 mW. - What is the conversion time of the ADS8881IDGSR?
The conversion time ranges from 500 ns to 710 ns. - What is the acquisition time of the ADS8881IDGSR?
The acquisition time is 290 ns. - What are some typical applications of the ADS8881IDGSR?
Typical applications include automatic test equipment, precision medical equipment, instrumentation and process controls, and low-power, battery-operated instruments. - Does the ADS8881IDGSR support daisy-chain operation?
Yes, the ADS8881IDGSR supports daisy-chain operation for cascading multiple devices.
